The average weight of T, U and V is 42 kg. If the average weight of T and U is 40 kg and the average weight of U and V is 36 kg, then what is the weight of U?

Correct option is C

Given:
Average of T, U and V = 42 kg, T and U = 40 kg, U and V = 36 kg.
Formula Used:
​$$Average= \frac{Sum of all values} {Number of values}​$$​​
Solution:

Total weight of T, U, V = 42 $$\times$$​ 3 = 126

Total weight of T and U = 40 $$\times$$​2 = 80

 Total weight of U and V = 36 $$\times$$​ 2 = 72.

Weight of U = [80+72] - [126] = 26 kg.​